Alarm-cable.



J. SULZBACHBR.

ALARM CABLE.

APPLICATION FILED 11130.30, 1911.

1,109,878. Patented Sept. 8, 1914.

. l `-Inventor.-

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FATNT @EF1-CE.

JEROME SULZBACHER, 0F NEW YORK, N. Y.

.ALARM-CABLE.

Specification of Letters Patent.

Application filed December 30,' 1911.

Patented Sept. 8, 1914.

Serial No. 668,649.-

To aZZwLo/ml it may concern:

Be it` known thatl, JEROME SULzBAoHE-R,

a citizen of the United States, and ai resident of the city, county., and State of New York,

ruptions of the circuit, .as bythe opening of a window or` door will .give an alarm, commonly known as a burglar alarm.

The object of my invention is to construct .such a cable .in a'novel, effective, and substantial way which shall be unusually quick, cert-ain and more specifically definite in its action'4 andV which shall have the added tea-I t-ureof lbeing used as a conduit for such wiringfasmay be desired4 for electric lights, telephones, bells or other devices -in the 'premises tobe protected by the alarm cable.

My cable is therefore preferably constructed with a hollow center `to serve as said conduit and .broadly speaking my invention consists in so arranging what maybe called theyburglar wires that they are'less accessible to the attack of cutting implements and so arranging lthe. thermostatic elementas to be suiliciently exposed `to allow quick aces's to the ameor heated air of an incipient re. t

v'Where a continuous thermostatic element is .employed-in alarm cables and where the same wire gives an'alarm from all interruptions inthe circuit, it is often diilicult to determine with necessary` uickness the exact location of the trouble. y improvedv cable is to be so constructed that the alarm given, whether delivered at a single point, or at many places as desired, always locates itself so that attention is directed to the exact spot wherethe trouble occurs. To this end instead of a continuous thermostatic element which by fusing, always short circuits the same two wires, I employ a num'ber of therlmostatic sections arranged at intervals along a cable consisting of `many diercnt wires so that each point at which the re is liable to o ccur has its corresponding thermostatic section and each sectlon acts upon a difierent oircult wire so that when an alarm is received at the various signal stations, it can only have come from the particular section which has given the alarm. p- With the burglar alarm it is not of so much importance, but wherever it is important, the same systeni lof section signaling can be employed.

ln the accompanying drawing, l have shown a very simple form' of my improved alarm cable, showing four sections; it being understood that the number of sections'corresponds to the number of rooms in the building or the number of separate buildings which may be included in the same alarm circuit.

.Figure l is a side elevation broken away to show Various portions.y Fig. v2 is a cross sectionvonn line 2-2 of Fig. 1.

- Same letters indicate similar parts' in the diderent drawings. l

A. is a tube ofany suitable material preferably of insulating material adapted yto serve as a conduit in. which one or more wires may be carried for the purpose of running electric lights, telephones, door bells `or other bells and for such other wires .as

are commonly used tor household or omce purposes. Around this copduit is wound the alarm portion of my improved cable,

.designated as B, and which-consists of any desired number of separate independent insulated signal wiresga, a, anda general circuit or current wire b, .(see Fig. 2). These various wires are preferably braided to form a net work ot considerable resistance to any attempt to cut the same as shown in Fig. l

`and may also be embedded in a fabric of insulating material c, although this latter is not' necessary.

C C represent a plurality ot thermostatic ysurfaces which areshown as arranged alon(r the cable at intervals. The dimensions an characterof these thermostatic portions will naturally varywith the space which they are 'to protect; the theory of my alarm cable being that eacli.thermostatic section or portionshould be of sulicient extent and character to adord substantial protection to the locality in which it is used, while the cable between protected stations needs no thermostatic covering. For example: where my improved alarm. cable is to be used or the protection of various rooms in the same building, the thermostatic portion in each room should present a suiiicient exposure to act quickly in response to any tire which starts in any part of said room, While that portion of the cable which passes through walls or floors needs no'thermostatic protect'ion being so located that fire could hardly attack it unless well advanced.

Where my alarm cable is to be used toy protect various floors or apartments in the same building the thermostatic portions will be located with regard tothe portions most liable to tire in each apartment or floor, as for instance near the heat apparatus, lighting apparatus, electric Wiring, or especially combustible articlesD For t-he same reason in stores the cable would preferablyl run along the counters and shelves as also any place where paper or other Waste is likely to be thrown. l

Where my improved cable is to be used for the protection of several buildings placed in the same circuit as, for instance factories, farm buildings, store houses etc., the same theory of exposure and protection applies on a larger scale. It will thus be seen that the number of thermostatic portions will correspond practically to the number of places which have to be identified and located by means of the alarm cable' and consequently the number of independent alarm Wires constituting the main bodyof the cable Will correspond in number withv said thermostatic sections. Each thermo-17 static section is to be so located on -the cable that, when it 'acts underv the influence of excess heat, whether caused by Same or by other undue elevation ofthe temperature beyond the fixed limits, it will `fuse or eapand or otherwise respond to this excess heat so as to bring about an electric connecf tion between the cabley signal wire correspending to said section and the circuit Wire olf the cable so that an alarm whethervisible oraural will be given, at such station or stations 'as may be selected for that purpose and placed within the general alarm circuit Where the number of protected places and thermostatie portions is small, a single circuit wire may be suiicient, but where their number is very large, a plurality of return Wires is preferable.

It will be readilyunderstood that the ad vantages of my improved alarm cable consist primarily in having the thermostatic portions most readily accessiblev and theren fore moet certain to respond in case of needS while the burglar portion is least accessible to attacka 'V/hile I have shown my imu choice, provided such eXtra coverings do not interfere with the proper and quick responsive action of the tliermostatic portions of the cablee By t-he above statement that the thermostatic section will fuse or expand or otherwise will respond to excess heat so as to `bring about an electric connection between its corresponding signal Wire, and the circuit Wire oi' the cable, I mean simply to call attention to the Well known fact thatl some thermostats bring about the necessary electrical connection by fusion, somel by expansion, and some by other well, known methods. I am not to be understood as saying that my thermostatic section is wholly composed'of fusible material in any case, nor do Iclaim any novelty in the method of bringing about the desired electric connection. The purpose of my invention is to provide an alarm cable of such construction that each protected station sends an independent and dis tinguishable signal instead' of a mere general alarm as heretofore.

I claim:

1. An alarm cable which comprises a number of signal Wires and a circuit wire held together by suitable coveringstc form the main body of the cable and a number of independent thermostatic sections arrpanged .at intervals on the outside of said main body and each adapted to bring about an electric connection. between corresponding signal 'wire and the circuit wire in response to excess he'at'; whereby each thermostatic section gives a diilerent alarm from every other thermostatic section.

2. An alarm cable which comprises a hollow tube adapted to serve as a conduit, a number of signal 'wires and a circuit wire held. together by suitable coverings to form the main body of the cable and a number of independent thermostatic 'sections arranged 'at intervals on, the youtside of said main body and each ada ted to bring about an electric connection vetween its correl spending signal Wire and the circuit Wire in response to excess heat; whereby each ther mostatic section gives a dilierent alarm from every other thermostatic section.

JEROME SULZBACHER.

Witnesses:

Tiioires J'. Eil/ira l?. Sinuenia 

